Airplane



FIG. 1 is a lower frontal side perspective view of an airplane depicting an example of our new design;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof; and

FIG. 6 is a bottom plan view thereof. 

The ornamental design for an airplane, as shown and described above. 